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[jira] Commented: (HIVE-1115) optimize combinehiveinputformat in presence of many partitions

Date

Tue, 27 Apr 2010 19:56:32 GMT

[ https://issues.apache.org/jira/browse/HIVE-1115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12861514#action_12861514
]
Paul Yang commented on HIVE-1115:
---------------------------------
Not quite sure if this will be completed this quarter - I believe MAPREDUCE-1501 was helpful
in handling a similar use case?
> optimize combinehiveinputformat in presence of many partitions
> --------------------------------------------------------------
>
> Key: HIVE-1115
> URL: https://issues.apache.org/jira/browse/HIVE-1115
> Project: Hadoop Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Paul Yang
>
> A query like :
> select .. from T where ...
> where T contains a very large number of partitions does not work very well with CombineHiveInputFomat.
> A pool is created per directory, which leads to a high number of mappers.
> In case all partitions share the same operator tree, and the same partition description,
only a single pool should be created.
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